<!DOCTYPE html>
<html>
<head>
<style>
.bg {
  position: absolute;
  left:   200px;
  top:    0px;
  width:  400px;
  height: 300px;
  background-image: url(resources/reference.png);
  -webkit-filter: blur(8px);
}
.box {
  position: absolute;
  left:   300px;
  top:    50px;
  width:  50px;
  height: 50px;
  background-color: green;
}
</style>
</head>
<body>
<div class="bg"></div>
<div class="box"></div>
</body>
</html>
